Removing these pages is an interesting development, and a welcomed one. These pages were confusing to the user and tough for developers to maintain, since they did not offer the same functionality of normal brand pages.
It appears that your app likes are not lost and can be transferred to a real brand page. It isn't clear if your page posts and comments can be migrated as well.
What do you think about these pages. Have you found them useful or a nuisance?